"When an Oxford man walks into the room, he walks in like he owns it. When a Cambridge man walks into the room, he walks in like he doesn't care who owns it." - my grandmother

"Always train your doubt most strongly on those ideas that you really want to be true." - Sean Carroll

"The first principle is that you must not fool yourself — and you are the easiest person to fool" - Richard Feynman

"On the plains of hesitation lie the blackened bones of countless millions who at the dawn of victory lay down to rest, and in resting died." - Adlai E. Stevenson

"Therefore Simplicio, come either with arguments and demonstrations and bring us no more Texts and authorities, for our disputes are about the Sensible World, and not one of Paper." - Salviati to Simplicio in Galileo's Dialogue On Two World Systems (1632)

"The larger the island of knowledge, the longer the shoreline of wonder." - Ralph W. Sockman

"The way to bring about the new age of peace and enlightenment is to assume it has already started" - ?